Provided are a light emitting device and a manufacturing method thereof. The amplifier circuit further comprises a comparator circuit operable to receive the output signal and generate a first control signal in response thereto. 5\xd710\u22123 cm3 cm2\xb7sec\xb7cm Hg or more, the ratio of the water vapor permeation rate to the oxygen gas permeation rate of the hollow fiber membranes is 10 or more, and the elongation at tensile break of the hollow fiber membranes after hot water treatment in hot water at 100\xb0 C. An outer gate is mounted to the body front portion for pivotal movement between a lock position and a load position.